Display device

ABSTRACT

A display device is provided and including first and second substrates, wherein the first substrate includes a first area, a second area overlapping the second substrate, a first edge extending in a first direction, a first terminal portion on the first area; the second substrate has a first protruding portion protruding toward the first edge of the first substrate and a second edge including a linear portion along the first edge and a curved portion connected to the linear portion and extending toward the first edge, the curved portion constitutes a part of a edge of the first protruding portion, and a width in the first direction of the first protruding portion gradually decreases toward the first edge.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/938,622, filed on Mar. 28, 2018, which application is based upon andclaims the benefit of priority from Japanese Patent Application No.2017-071575, filed Mar. 31, 2017, the entire contents of which areincorporated herein by reference.

FIELD

Embodiments described herein relate generally to a display device.

BACKGROUND

In recent years, sensors capable of detecting contact or approach of anobject such as a finger have been put into practical use as displaydevice interfaces or the like. As an example of such sensors, acapacitive touch panel comprises an electrode which detects variation inelectrostatic capacitance caused by the contact of the object. Forexample, a touch panel formed by bonding a first transparent substratein which a first transparent electrode and a first connection terminalare disposed on an upper surface of a first resin film and a secondtransparent substrate in which a second transparent electrode and asecond connection terminal are disposed on an upper surface of a secondresin film, by an adhesive layer, has been proposed. The firsttransparent substrate is disposed on the second transparent substrateand includes a notch which exposed the second connection terminal. Thefirst connection terminal and the second connection terminal are therebyconnected to a single flexible substrate.

Incidentally, for example, not only a flexible substrate necessary tocontrol a display panel, but also a flexible substrate necessary tocontrol the touch panel are required for a sensor-equipped displaydevice. Narrowing the frame may be prevented due to restrictions fordisposing these two flexible substrates.

SUMMARY

The present disclosure generally relates to a display device.

According to one embodiment, a display device includes a first substrateincludes a first area, a second area adjacent to the first area, and afirst terminal portion located in the first area, and a second substrateincludes an edge including a linear portion located between the firstarea and the second area, the second substrate overlapping the secondarea, wherein the second substrate further comprises a protrudingportion protruding than the linear portion and a second terminal portionlocated in the protruding portion, and the display device furthercomprises a holding layer holding a gap between the second area and theprotruding portion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view showing a configuration exampleof a display device DSP according to the embodiments.

FIG. 2 is a plan view showing the display device DSP shown in FIG. 1.

FIG. 3 is a diagram showing a basic configuration and an equivalentcircuit, of the display device DSP shown in FIG. 1.

FIG. 4 is a cross-sectional view showing a structure of several parts ofthe display device DSP shown in FIG. 3.

FIG. 5 is a diagram showing a configuration of the sensor SS.

FIG. 6 is a plan view showing a configuration example of a displaydevice DSP comprising the sensor SS.

FIG. 7 is a plan view showing a comparative example of the displaydevice DSP comprising the sensor SS.

FIG. 8 is a plan view showing the other configuration example of thedisplay device DSP comprising the sensor SS.

FIG. 9 is a plan view showing the other configuration example of thedisplay device DSP.

FIG. 10 is a diagram showing a configuration example of the displaydevice DSP comprising a first flexible substrate FS1 and a secondflexible substrate FS2.

FIG. 11 is a diagram showing the other configuration example of thedisplay device DSP comprising the first flexible substrate FS1 and thesecond flexible substrate FS2.

FIG. 12 is a diagram showing the other configuration example of thedisplay device DSP comprising a single flexible substrate FS.

FIG. 13 is a diagram showing an example of a layout of the firstterminal portion T1.

FIG. 14 is a plan view showing an example applied to the display deviceDSP according to the embodiments.

FIG. 15 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

FIG. 16 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

FIG. 17 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

FIG. 18 is a cross-sectional view showing the display device DSPcomprising a second terminal portion T2 cut along line A-B in FIG. 10.

FIG. 19 is a cross-sectional view showing the display device DSPcomprising a second terminal portion T2 cut along line A-B in FIG. 10.

FIG. 20 is a diagram showing the other configuration example of thedisplay device DSP.

FIG. 21 is a diagram showing the other example of the layout of thefirst terminal portion T1.

FIG. 22 is a plan view showing a modified example of the embodiments.

FIG. 23 is a plan view showing a third modified example of theembodiments.

FIG. 24 is a cross-sectional view showing the display device DSPcomprising a sensor SN cut along line C-D in FIG. 23.

FIG. 25 is a plan view showing a connection structure example of thesensor SN and the second flexible substrate FS2.

FIG. 26 is a plan view showing the other connection structure example ofthe sensor SN and the second flexible substrate FS2.

DETAILED DESCRIPTION

In general, according to one embodiment, a display device comprises afirst substrate comprising a first area, a second area adjacent to thefirst area, and a first terminal portion located in the first area, anda second substrate comprising an edge including a linear portion locatedbetween the first area and the second area, the second substrateoverlapping the second area, wherein the second substrate furthercomprises a protruding portion protruding than the linear portion and asecond terminal portion located in the protruding portion, and thedisplay device further comprises a holding layer holding a gap betweenthe second area and the protruding portion.

According to another embodiment, a display device comprises a firstsubstrate comprising a first terminal portion, a second substratecomprising a second terminal portion, an overlap portion at which thefirst substrate and the second substrate overlap, and a non-overlapportion at which the first substrate and the second substrate do notoverlap, wherein the overlap portion comprises a display portion and aframe portion, the first terminal portion is located in the non-overlapportion, and the second terminal portion is located in the frameportion.

Embodiments will be described hereinafter with reference to theaccompanying drawings. The disclosure is a mere example, and arbitrarychange of gist which can be easily conceived by a person of ordinaryskill in the art naturally falls within the inventive scope. To moreclarify the explanations, the drawings may pictorially show width,thickness, shape and the like, of each portion as compared with anactual aspect, but they are mere examples and do not restrict theinterpretation of the invention. In the present specification anddrawings, elements like or similar to those in the already describeddrawings may be denoted by similar reference numbers and their detaileddescriptions may be arbitrarily omitted.

FIG. 1 is an exploded perspective view showing a configuration exampleof a display device DSP according to the embodiments. In the drawing, afirst direction X and a second direction Y intersect each other, and athird direction Z intersects the first direction X and the seconddirection Y. For example, the first direction X, the second direction Y,and the third direction Z are orthogonal to each other but may intersectat an angle other than 90 degrees. In the present specification, anobservation position at which the display device DSP is observed isassumed to be located on a tip side of an arrow indicating the thirddirection Z, and viewing from the observation position toward the X-Yplane defined by the first direction X and the second direction Y iscalled a planar view.

In the embodiments, a liquid crystal display device will be explained asan example of the display device. The major configuration explained inthe present embodiment can also be applied to a self-luminous displaydevice comprising an organic electroluminescent display element, and thelike, an electronic paper display device comprising an electrophoreticelement, and the like, a display device employingmicro-electromechanical systems (MEMS), or a display device employingelectrochromism.

FIG. 1 shows the only major portions of the display device DSP. Thedisplay device DSP comprises a first substrate SUB1 and a secondsubstrate SUB2. The first substrate SUB1 includes a first area A1, asecond area A2 adjacent to the first area A1, and a first terminalportion T1 located in the first area A1. The first substrate SUB1includes a first upper surface SUB1A facing the second substrate SUB2.The first terminal portion T1 is provided on the first upper surfaceSUB1A. In the example illustrated, the first area A1 is an areaextending in the first direction X, and the first terminal portion T1comprises a plurality of terminals arranged in the first direction X asexplained later in detail.

The second substrate SUB2 includes an edge EG located between the firstarea A1 and the second area A2, and overlaps the second area A2 througha gap in the third direction Z. In other words, the edge EG makes aboundary between the first area A1 and the second area A2. In thepresent specification, “overlap” indicates not only a case where twomembers overlap in a state of being in contact with each other, but alsoa case where in planar view, two members overlap while spaced apart fromeach other with an air layer or the other member interposed between themembers. The edge EG includes a linear portion EL extending in the firstdirection X. The second substrate SUB2 includes a protruding portion Pwhich protrudes more than the linear portion EL in the second directionY, and a second terminal portion T2 located in the protruding portion P.The second substrate SUB2 includes a second upper surface SUB2A and asecond lower surface SUB2B facing the first substrate SUB1. The secondterminal portion T2 is provided on the second upper surface SUB2A. Inthe example illustrated, the edge EG includes a curved portion ECconnected to the linear portion EL. The protruding portion P includesthe curved portion EC. The second terminal portion T2 comprises aplurality of terminals arranged in the first direction X as explainedlater in detail. If the first substrate SUB1 is defined in a state inwhich the second substrate SUB2 and the first substrate SUB1 overlap, anarea of the first substrate SUB1 which overlaps the second substrateSUB2 corresponds to the second area A2 and an area which does notoverlap the second substrate SUB2 corresponds to the first area A1. Inother words, an area of the first substrate SUB1 which the protrudingportion P of the second substrate SUB2 overlaps also corresponds to thesecond area A2.

The protruding portion P overlap the second area A2 via a gap in thethird direction Z. A holding layer HL which holds the gap is providedbetween the second area A2 and the protruding portion P. For example,the holding layer HL is an adhesive layer bonding the first substrateSUB1 and the second substrate SUB2, a resin layer formed on at least oneof the first substrate SUB1 and the second substrate SUB2, beads, or thelike. The shape of the holding layer HL is not particularly limited. Theholding layer HL should desirably be located directly under the secondterminal portion T2 from the viewpoint of suppressing the deformation ofthe second substrate SUB2 when a flexible substrate is crimped on thesecond terminal portion T2 later.

FIG. 2 is a plan view showing the display device DSP shown in FIG. 1.The display device DSP comprises an overlap portion OP where the firstsubstrate SUB1 and the second substrate SUB2 overlap, and a non-overlapportion NOP where the first substrate SUB1 and the second substrate SUB2do not overlap. The overlap portion OP comprises a display portion DAwhich displays an image and a frame portion NDA which surrounds thedisplay portion DA. The non-overlap portion NOP is a part of the firstsubstrate SUB1 and corresponds to the first area A1 shown in FIG. 1. Thefirst terminal portion T1 is located at the non-overlap portion NOP. Thesecond terminal portion T2 is located at the frame portion NDA. Theprotruding portion P at which the second terminal portion T2 is disposedis included in the frame portion NDA in the example illustrated. Thenon-overlap portion NOP of the first substrate SUB1 and the protrudingportion P of the second substrate SUB2 are aligned in the firstdirection X. The non-overlap portion NOP and the display portion DA arealigned in the second direction Y. The non-overlap portion NOP and theprotruding portion P are aligned in the second direction Y.

The edge EG of the second substrate SUB2 includes a first portion EG1located between the display portion DA and the first terminal portionT1, and a second portion EG2 located between the first terminal portionT1 and the second terminal portion T2, in planar view. The first portionEG1 extends in the first direction X and corresponds to theabove-explained linear portion EL. The second portion EG2 is connectedto the first portion EG1 and extends in a direction different from thefirst direction X. For example, the second portion EG2 corresponds tothe curved portion EC but may be a linear portion extending in adirection different from the first direction X.

The protruding portion P corresponds to a portion which protrudes thanthe first portion EG1 in the second direction Y, and includes the secondportion EG2.

The first terminal portion T1 located at the non-overlap portion NOP andthe second terminal portion T2 located at the protruding portion P arelocated on a straight line L1 extending in the first direction X, inplanar view.

FIG. 3 is a diagram showing a basic configuration and an equivalentcircuit, of the display device DSP shown in FIG. 1. The display deviceDSP comprises pixels PX, scanning lines G (G1 to Gn), signal lines S (S1to Sm), common electrodes CE and the like, in the display portion DA.The pixels PX are arranged in the first direction X and the seconddirection Y. The scanning lines G extend in the first direction X so asto be arranged in the second direction Y. The signal lines S extend inthe second direction Y so as to be arranged in the first direction X.The common electrode CE is disposed over the pixels PX.

A display driver DD includes at least several parts of a signal linedriver SD, scanning line drivers GD1 and GD2, and a common electrodedriver CD. The odd-numbered scanning lines G are connected to thescanning line driver GD1 while the even-numbered scanning lines G areconnected to the scanning line driver GD2. The signal lines S areconnected to the signal line driver SD. The common electrodes CE areconnected to the common electrode driver CD.

Each of the pixels PX comprises a switching element SW, a pixelelectrode PE, the common electrode CE, a liquid crystal layer LC and thelike. The switching element SW is electrically connected to the scanningline G and the signal line S. The pixel electrode PE is electricallyconnected to the switching element SW. The pixel electrode PE is opposedto the common electrode CE, and drives the liquid crystal layer LC by anelectric field formed between the pixel electrode PE and the commonelectrode CE. A storage capacitor CS is formed, for example, between thecommon electrode CE and the pixel electrode PE.

FIG. 4 is a cross-sectional view showing a structure of several parts ofthe display device DSP shown in FIG. 3. In the example illustrated, thedisplay device DSP is configured to correspond to the display modemainly using the lateral electric field approximately parallel to a mainsurface of the substrate. The configuration of the display device DSP isnot limited to the example illustrated. The display device DSP may beconfigured to correspond to a display mode using a vertical electricfield perpendicular to the main surface, an oblique electric fieldinclined to the main surface or a combination of the electric fields.The main surface is a surface parallel to an X-Y plane.

The first substrate SUB1 includes a first insulating substrate 10, asignal line S, a common electrode CE, a pixel electrodes PE, a firstinsulating film 11, a second insulating film 12, a third insulating film13, a first alignment film AL1, and the like. It should be noted thatswitching element, scanning line, various insulating films interposedbetween the switching element and scanning line, and the like are notillustrated in the drawing. The first insulating substrate 10 is asubstrate having a light transmitting property such as a glass substrateor a resin substrate.

The second substrate SUB2 includes a second insulating substrate 20, alight-shielding layer BM, a color filter CF, an overcoat layer OC, asecond alignment film AL2, and the like. The color filter CF may bedisposed on the first substrate SUB1.

The liquid crystal layer LC is located between the first substrate SUB1and second substrate SUB2 and held between the first alignment film AL1and the second alignment film AL2.

A sensor built in the display device DSP of the present embodimentcomprises a detection electrode Rx. In the example illustrated, thedetection electrode Rx is located on the second upper surface SUB2A ofthe second substrate SUB2. The detection electrode Rx is formed of asingle metallic material, a plurality of metallic materials, an alloycontaining a combination of the metallic materials, a transparent oxidematerial such as ITO or IZO, a conductive organic material, a dispersingmember of a fine conductive material, and the like. The detectionelectrode Rx may have a single-layer structure or a multi-layerstructure formed by stacking a plurality of thin films. The shape of thedetection electrode Rx is, for example, a strip shape, a wave shape, agrating shape, a mesh shape, and the like.

A first optical element OD1 including a first polarizer PL1 is locatedbetween the first insulating substrate 10 and an illumination device IL.A second optical element OD2 including a second polarizer PL2 is locatedon the detection electrode Rx.

Next, a configuration example of a sensor SS built in the display deviceDSP of the embodiments will be explained. The sensor SS hereinafterexplained is, for example, a capacitive sensor, which detects contact orapproach of the object to the display device DSP, based on the variationin electrostatic capacitance between a pair of electrodes on oppositesides of a dielectric.

FIG. 5 is a diagram showing a configuration of the sensor SS. The sensorSS comprises sensor drive electrodes (first electrodes) Tx and detectionelectrodes (second electrodes) Rx. The sensor drive electrodes Tx areformed by common electrodes CE on the first substrate SUB1 shown in FIG.4. In other words, the common electrodes CE function as the commonelectrodes CE for display and the sensor drive electrodes Tx serving assensors SS. As shown in FIG. 4, the detection electrode Rx is located onthe second upper surface SUB2A.

In the example illustrated, the sensor driving electrodes Tx intersectthe detection electrodes Rx in planar view.

The detection electrodes Rx are electrically connected to a detectioncircuit DC. The common electrode driver CD supplies common drive signalsto the common electrodes CE in a display period for displaying an image.Thus, an electric field is generated between the common electrode CE andthe pixel electrodes PE, and an alignment direction of the liquidcrystal molecules of the liquid crystal layer LC is varied from aninitial alignment direction, based on the electric field. In addition,the display device DSP has a sensor period for detecting contact orapproach of an object after the display period. In the sensor period,the sensor drive signal is supplied to a target common electrode CE, andthe common electrode CE thereby serves as the sensor drive electrode Tx.The sensor drive electrode Tx urges capacitance to be generated betweenthe detection electrode Rx and the sensor drive electrode Tx. Thedetection electrode Rx outputs a sensor signal necessary for sensing(i.e., a signal based on variation of inter-electrode capacitancebetween the sensor drive electrode Tx and the detection electrode Rx) inaccordance with supply of the sensor drive signal to the sensor driveelectrode Tx. The detection circuit DC reads the sensor signal from thedetection electrode Rx, detects contact or approach of the object to thedisplay device DSP, and detects position information of the object, andthe like.

The above-explained sensor SS is not limited to a mutual-capacitivesensor capable of detecting the object, based on the variation inelectrostatic capacitance between a pair of electrodes (in the aboveexample, the electrostatic capacitance between the sensor driveelectrode Tx and the detection electrode Rx), but may be aself-capacitive sensor capable of detecting the object, based on thevariation in electrostatic capacitance between the sensor driveelectrode Tx and the object or between the detection electrode Rx andthe object.

FIG. 6 is a plan view showing a configuration example of a displaydevice DSP comprising the sensor SS. The display device DSP comprises afirst edge E1 and a second edge E2 which extend in the second directionY, and a third edge E3 and a fourth edge E4 which extend in the firstdirection X. The detection electrodes Rx are located on the displayportion DA and arranged in the second direction Y to be spaced apartfrom each other. Each of the detection electrodes Rx extends in thefirst direction X. The second terminal portion T2 comprises a pluralityof terminals T arranged in the first direction X to be spaced apart fromeach other. The detection electrodes Rx and the terminals T areelectrically connected by leads L. The detection electrodes Rx, theterminals T, and the leads L are located on the second upper surfaceSUB2A. The terminals T and the leads L are located at a frame portionNDA.

An example of a layout of the terminals T and the leads L will beexplained here. In the example illustrated, leads L connected to theodd-numbered detection electrodes Rx counted from the third edge E3, ofthe leads L, extend between the display portion DA and the first edge E1and between the display portion DA and the edge EG and are connected tothe terminals T of the protruding portion P. The leads L connected tothe even-numbered detection electrodes Rx counted from the third edge E3extend between the display portion DA and the second edge E2 and areconnected to the terminals T.

FIG. 7 is a plan view showing a comparative example of the displaydevice DSP comprising the sensor SS. In the example illustrated, thesecond substrate SUB2 comprises the linear edge EG extending in thefirst direction X but does not comprise a protruding portion. In thiscomparative example, the second terminal portion T2 is located at aframe portion NDA4 between the display portion DA and the edge EG.

According to the configuration example of the present embodiment, thesecond substrate SUB2 comprises the protruding portion P, and the secondterminal portion T2 is located at the protruding portion P. For thisreason, according to the configuration example shown in FIG. 6, a widthLY11 of the frame portion NDA4 in the second direction Y can be madeshorter than a width LY12 of the frame portion NDA4 in the seconddirection Yin the comparative example shown in FIG. 7. In addition,according to the configuration example shown in FIG. 6, a frame widthLY21 between the display portion DA and the fourth edge E4 in the seconddirection Y can be made shorter than a frame width LY22 between thedisplay portion DA and the fourth edge E4 in the second direction Y inthe comparative example shown in FIG. 7. For this reason, the frame canbe narrowed.

FIG. 8 is a plan view showing the other configuration example of thedisplay device DSP comprising the sensor SS. The configuration exampleshown in FIG. 8 is different from the configuration example in FIG. 6with respect to a layout of the terminals T and the leads L. The secondterminal portion T2 comprises a plurality of terminals TA arranged inthe first direction X to be spaced apart from each other, and aplurality of terminals TB arranged in the first direction X to be spacedapart from each other. The leads LA extend at the frame portions NDA1and NDA4 and are connected to the terminals TA. The leads LB extend atthe frame portion NDA2 and are connected to the terminals TB. In otherwords, each of the detection electrodes Rx is connected to the terminalTA via the lead LA and is connected to the terminal TB via the lead LB.The number of terminals TA, the number of terminals TB, the number ofleads LA, and the number of leads LB are equal to or larger than thenumber of detection electrodes Rx.

In the configuration example shown in FIG. 8, too, the same advantagescan be obtained.

A configuration in which a display function layer other than the liquidcrystal layer, for example, an electrophoretic layer or a self-luminousdisplay element layer is interposed between the first substrate SUB1 andthe second substrate SUB2 can also be adopted in the configurationexample shown in FIG. 8. In this case, mutual capacitance orself-capacitance touch electrodes are disposed on the second substrateSUB2.

Next, the other configuration example of the display device DSP in whichthe edge EG includes a curved portion EC will be explained.

FIG. 9 is a plan view showing the other configuration example of thedisplay device DSP. When the second substrate SUB2 comprising theprotruding portion P is formed, the edge EG including the curved portionEC as illustrated is formed. For example, if the second substrate SUB2is formed on a based of a glass substrate, the second substrate SUB2having the illustrated shape is cut and formed by using a cutting membersuch as a wheel cutter. When the present configuration example in whichthe cutting member moves along the linear portion EL and the curvedportion EC is compared with the comparative example in which the cuttingmember moves along the dotted line in the figure, the movement distanceof the cutting member can be made shorter in the present configurationexample than in the comparative example. Furthermore, the operation ofturning the cutting member can be omitted in the present configurationexample.

In addition, the leads L located on the frame portion NDA4 can beconnected to the terminals T via inclined portions OL along the curvedportion EC. In the comparative example, the illustrated inclinedportions OL cannot be formed, and the leads L are connected to theterminals T via a linear portion LL as represented by a one-dot-chainedline in the figure. For this reason, the length of the leads L can bemade shorter than the length in the comparative example and the lineresistance of the leads L can be reduced. In addition, concentration ofthe lines around the terminal portions can be reduced.

FIG. 10 is a diagram showing a configuration example of the displaydevice DSP comprising a first flexible substrate FS1 and a secondflexible substrate FS2.

The first flexible substrate FS1 comprises a connection portion CN1connected to the non-overlap portion NOP or the first area A1 of thefirst substrate SUB1 and the connection portion CN1 is connected to thefirst terminal portion T1. The second flexible substrate FS2 comprises aconnection portion CN2 connected to the protruding portion P of thesecond substrate SUB2 and the connection portion CN2 is connected to thesecond terminal portion T2. A connection portion CN3 of the firstflexible substrate FS1 is connected to a connection portion CN4 of thesecond flexible substrate FS2. The connection portions CN1 to CN4 arerepresented by hatch lines in the figure.

An IC chip I1 is connected to the non-overlap portion NOP. The IC chipI1 incorporates, for example, at least a part of the display driver DDshown in FIG. 3. The IC chip 12 is connected to the first flexiblesubstrate FS1. The IC chip 12 incorporates, for example, the detectioncircuit DC shown in FIG. 5. The second terminal portion T2 and the ICchip 12 are electrically connected to each other. The IC chip I1 and theIC chip 12 are electrically connected to each other.

According to the configuration example, as compared with the comparativeexample shown in FIG. 7, since the second terminal portion T2 can bedisposed near the fourth edge E4, the length in the second direction Y,of the second flexible substrate FS2 connected to the second terminalportion T2, can be shortened and the second flexible substrate FS2 canbe downsized.

FIG. 11 is a diagram showing the other configuration example of thedisplay device DSP comprising the first flexible substrate FS1 and thesecond flexible substrate FS2.

The configuration example shown in FIG. 11 is different from theconfiguration example shown in FIG. 10 with respect to a feature thatthe IC chip I1 is connected to the first flexible substrate FS1. Thefirst flexible substrate FS1 comprises a first connection portion CN1connected to the first terminal portion T1 and a third connectionportion CN3 connected to the second flexible substrate FS2, in the sameplane (i.e., the lower surface of the first flexible substrate FS1). TheIC chip I1 is connected to the lower surface of the first flexiblesubstrate FS1.

The second flexible substrate FS2 comprises a second connection portionCN2 connected to the second terminal portion T2 and a fourth connectionportion CN4 connected to the first flexible substrate FS1. The secondconnection portion CN2 is disposed on a lower surface of the secondflexible substrate FS2. The fourth connection portion CN4 is disposed onan upper surface of the second flexible substrate FS2. The IC chip 12 isconnected to the lower surface or the upper surface of the secondflexible substrate FS2.

According to this configuration example, as compared with theconfiguration example shown in FIG. 10, the frame width of thenon-overlap portion NOP in the second direction Y can be reduced and theframe can be further narrowed.

FIG. 12 is a diagram showing the other configuration example of thedisplay device DSP comprising a single flexible substrate FS.

The configuration example shown in FIG. 12 is different from theconfiguration examples shown in FIG. 10 and FIG. 11 with respect to afeature of comprising a single flexible substrate FS connected to bothof the first terminal portion T1 and the second terminal portion T2. Theflexible substrate FS comprises the first connection portion CN1connected to the first terminal portion T1 and the second connectionportion CN2 connected to the second terminal portion T2. In addition,the flexible substrate FS comprises the IC chip I1. For example, the ICchip I1 incorporates at least a part of the display driver DD shown inFIG. 3 to drive the pixels PX in the display period, and incorporatesthe detection circuit DC shown in FIG. 5 to drive the sensor SS in thesensing period. The IC chip I1 comprises a function of converting ananalog signal received from the sensor SS in the sensing period intodigital data and outputting the digital data to a host which executesposition detection and the like.

According to this configuration example, as compared with theconfiguration examples shown in FIG. 10 and FIG. 11, the number offlexible substrates can be reduced and costs can also be reduced. Inaddition, a connector to electrically connect a plurality of flexiblesubstrates to each other is unnecessary.

FIG. 13 is a diagram showing an example of a layout of the firstterminal portion T1.

A width W11 in the first direction X between the first edge E1 and thefirst terminal portion T1 is smaller than a width W12 in the firstdirection X between the first terminal portion T1 and the second edgeE2. The protruding portion P is located between the first terminalportion T1 and the second edge E2.

In the example illustrated, the first terminal portion T1 comprises afirst terminal group TG11 and a second terminal group TG12. The firstterminal group TG11 and the second terminal group TG12 are arranged inthe first direction X. The first terminal group TG11 and the secondterminal group TG12 are connected to a first line group CG1 and a secondline group CG2 to drive the display portion DA, respectively. The firstterminal group TG11 and the second terminal group TG12 are arrangedasymmetrically with respect to a center line CL from which the firstedge E1 and the second edge E2 are separated in an equal distance. Inaddition, the first line group CG1 and the second line group CG2 arearranged asymmetrically with respect to the center line CL.

In this layout, the protruding portion P can be provided withoutoverlapping the first terminal portion T1 and, furthermore, the firstterminal portion T1 and the second terminal portion T2 can be arrangedin line.

Next, an example of the holding layer HL shown in FIG. 1 will beexplained.

FIG. 14 is a plan view showing an example applied to the display deviceDSP according to the embodiments.

In a first example shown in FIG. 14(A), an adhesive layer SE which bondsthe first substrate SUB1 and the second substrate SUB2 is disposed onthe overlap portion OP, and corresponds to a sealant which seals theliquid crystal layer LC. The adhesive layer SE comprises an adhesiveportion SE1 extending along the first edge E1, an adhesive portion SE2extending along the second edge E2, an adhesive portion SE3 extendingalong the third edge E3, an adhesive portion SE4 extending along thefourth edge E4, and an adhesive portion SE5 extending along the edge EG.The adhesive portion SE2 is longer than the adhesive portion SE1. A partSE21 of the adhesive portion SE2, the adhesive portion SE4, and a partSE51 of the adhesive portion SE5 overlap the protruding portion P, andthese correspond to the holding layer HL which holds a gap between thefirst substrate SUB1 and the protruding portion P. In the exampleillustrated, the adhesive portion SE4 is located directly under thesecond terminal portion T2. For this reason, when the flexible substrateis crimped on the second terminal portion T2, the holding layer HLincluding the adhesive portion SE4 supports the second substrate SUB2and deformation of the second substrate SUB2 can be thereby suppressed.In addition, since the liquid crystal layer LC is also located on theprotruding portion P, the display portion DA may also be provided on theprotruding portion P.

A second example shown in FIG. 14(B) is different from the first examplewith respect to a feature that the adhesive layer SE is formed in aquadrilateral shape. The adhesive layer SE comprises the adhesiveportions SE1 and SE2 which extend in the second direction Y and have anequal length, and the adhesive portions SE3 and SE6 which extend in thefirst direction X and have an equal length. Neither the adhesive layerSE nor the liquid crystal layer LC is interposed between the firstsubstrate SUB1 and the protruding portion P. In contrast, the holdinglayer HL is provided at a position remote from the adhesive layer SE andthe liquid crystal layer LC, in an area where the first substrate SUB1and the protruding portion P overlap. In the example illustrated, theholding layer HL is located directly under the second terminal portionT2. In the second example, too, the same advantages as those of thefirst example can be obtained.

FIG. 15 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

In a third example shown in FIG. 15(A), the part SE21 of the adhesiveportion SE2 and the part SE51 of the adhesive portion SE5 overlap theprotruding portion P, and these correspond to the holding layer HL whichholds the gap between the first substrate SUB1 and the protrudingportion P. The parts SE21 and SE51 are spaced apart from each other. Anair layer exists between the first substrate SUB1 and the protrudingportion P directly under the second terminal portion T2, and a part ofthe second terminal portion T2 overlaps the parts SE21 and SE51. In thethird example, too, the same advantages as those of the first examplecan be obtained. The holding layer HL may be additionally provideddirectly under the second terminal portion T2, similarly to the secondexample.

In a fourth example shown in FIG. 15(B), the part SE21 of the adhesiveportion SE2, the adhesive portion SE4, and the part SE51 of the adhesiveportion SE5 overlap the protruding portion P, and these correspond tothe holding layer HL which holds the gap between the first substrateSUB1 and the protruding portion P. An area surrounded by the adhesiveportions SE4 and SE6, and the parts SE21 and SE51 is sealed and theliquid crystal layer LC is not disposed. In the fourth example, too, thesame advantages as those of the first example can be obtained. Theholding layer HL may be additionally provided directly under the secondterminal portion T2, similarly to the second example.

In a fifth example shown in FIG. 15(C), a gap between the firstsubstrate SUB1 and the protruding portion P is filled with the adhesivelayer SE. In other words, the adhesive layer SE of the area where thefirst substrate SUB1 and the protruding portion P overlap corresponds tothe holding layer HL and is located directly under the second terminalportion T2. In the fifth example, too, the same advantages as those ofthe first example can be obtained.

FIG. 16 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

A sixth example shown in FIG. 16(A) is different from the first examplewith respect to a feature that the edge EG of the second substrate SUB2includes a linear portion EL2 located at the side closer to the liquidcrystal layer LC than to the fourth edge E4. The liquid crystal layer LCand a part of the adhesive layer SE are disposed in the area where thefirst substrate SUB1 and the protruding portion P overlap. The adhesivelayer SE which functions as the holding layer HL is located directlyunder the second terminal portion T2. In the sixth example, too, thesame advantages as those of the first example can be obtained.

A seventh example shown in FIG. 16(B) is different from the secondexample with respect to a feature that the edge EG of the secondsubstrate SUB2 includes the linear portion EL2. Neither the liquidcrystal layer LC nor a part of the adhesive layer SE is disposed in thearea where the first substrate SUB1 and the protruding portion Poverlap. The holding layer HL is located directly under the secondterminal portion T2. In the seventh example, too, the same advantages asthose of the first example can be obtained.

The above-explained first to seventh examples can also be applied to thedisplay device DSP comprising a round portion. A representative examplewill be explained hereinafter with reference to FIG. 17.

FIG. 17 is a plan view showing the other example applied to the displaydevice DSP according to the embodiments.

The display device DSP of an eighth example shown in FIG. 17(A)comprises a round portion R14 shaped in a protruding arc, which islocated between the first edge E1 and the fourth edge E4, and a roundportion R24 shaped in a protruding arc, which is located between thesecond edge E2 and the fourth edge E4. The other constituent elementsare the same as those of the first example, and a part of the adhesivelayer SE is located directly under the second terminal portion T2.

The curvature of the curved portion EC should desirably be the same asthe curvature of the round portion R14.

The display device DSP of a ninth example shown in FIG. 17(B) isdifferent from the second example with respect to a feature that thedisplay device DSP comprises the round portions R14 and R24, and is thesame as the second example with respect to the other constituentelements.

The display device DSP of a tenth example shown in FIG. 17(C) isdifferent from the seventh example with respect to a feature that thedisplay device DSP comprises the round portions R14 and R24, and is thesame as the seventh example with respect to the other constituentelements.

In any one of the above-explained examples, too, the same advantages asthose explained above can be obtained.

FIG. 18 is a cross-sectional view showing the display device DSPcomprising a second terminal portion T2 cut along line A-B in FIG. 10.The configuration of the holding layer HL will be particularlyexplained.

The cross-sectional view shown in FIG. 18(A) corresponds to, forexample, the first example shown in FIG. 14(A). The adhesive portion SE4of the adhesive layer SE is bonded to the first substrate SUB1 and theprotruding portion P and is located directly under the second terminalportion T2. The second flexible substrate FS2 is connected to the secondterminal portion T2. The adhesive portion SE4 corresponds to the holdinglayer HL.

The cross-sectional view shown in FIG. 18(B) corresponds to, forexample, the second example shown in FIG. 14(B). The holding layer HL isspaced apart from the adhesive portion SE6 of the adhesive layer SE. Forexample, the holding layer HL can be formed of a resin layer. Theholding layer HL is formed in, for example, a columnar shape or a wallshape extending in the third direction Z and is located between thefirst substrate SUB1 and the protruding portion P. For example, theholding layer HL may be formed on the first substrate SUB1 or the secondsubstrate SUB2, or may be formed by making protrusions formed on thefirst substrate SUB1 and the second substrate SUB2 protrude toward eachother.

FIG. 19 is a cross-sectional view showing the display device DSPcomprising a second terminal portion T2 cut along line A-B in FIG. 10.The configuration of the area overlapping the protruding portion P willbe particularly explained.

In a configuration example shown in FIG. 19(A), the protruding portion Poverlaps a transparent portion DST of the display device DSP. Alight-shielding member is not substantially disposed on the first uppersurface SUB1A and the first lower surface SUB1B of the first substrateSUB1 which overlaps the protruding portion P, and between the firstupper surface SUB1A and the protruding portion P, and the lighttraveling from the first lower surface SUB1B toward the protrudingportion P can be transmitted. For example, the second substrate SUB2comprises the light-shielding layer BM explained with reference to FIG.4 on the second lower surface SUB2B, and also comprises a peripherallight-shielding layer BMP in an area overlapping the adhesive layer SE.However, the peripheral light-shielding layer BMP is not disposed in anarea overlapping the protruding portion P. In this configurationexample, when the second flexible substrate FS2 is connected to thesecond terminal portion T2 provided on the protruding portion P,alignment of the second terminal portion T2 and the second flexiblesubstrate FS2 can be executed by using the light transmitted from thefirst substrate SUB1.

In a configuration example shown in FIG. 19(B), the protruding portion Poverlaps a light-shielding portion DSS of the display device DSP. Thelight-shielding portion DSS is, for example, a peripherallight-shielding layer BMP disposed in the area which overlaps theprotruding portion P. The light-shielding portion DSS is not necessarilyprovided on the second substrate SUB2, but may be provided on the firstsubstrate SUB1 or may be provided between the first substrate SUB1 andthe second substrate SUB2. In this configuration example, leakage oflight at the protruding portion P can be suppressed.

In a configuration example shown in FIG. 19(C), the protruding portion Poverlaps a reflecting portion DSR of the display device DSP. Thereflecting portion DSR is, for example, a metal layer disposed in thearea which overlaps the protruding portion P. The reflecting portion DSRis not necessarily provided on the first substrate SUB1 but may beprovided on the second substrate SUB2. In this configuration example,when the second flexible substrate FS2 is connected to the secondterminal portion T2, alignment of the second terminal portion T2 and thesecond flexible substrate FS2 can be executed by using the lightreflected from the reflecting portion DSR. In addition, leakage of lightat the protruding portion P can be suppressed.

FIG. 20 is a diagram showing the other configuration example of thedisplay device DSP.

The configuration example shown in FIG. 20(A) is different from theabove-explained configuration examples with respect to a feature thatthe second substrate SUB2 comprises a protruding portion P locatedbetween the first terminal group TG11 and the second terminal group TG12of the first terminal portion T1. The second terminal portion T2 of theprotruding portion P is located between the first terminal group TG11and the second terminal group TG12 in planar view. In the exampleillustrated, the first terminal group TG11, the second terminal portionT2, and the second terminal group TG12 are arranged in this order in thefirst direction X and located in line in the first direction X. Ofcourse, this configuration allows slight displacement of the terminalgroup in the second direction Y. The first connection portion CN1 of thefirst flexible substrate FS1 comprises a connection portion CN11connected to the first terminal group TG11 and a connection portion CN12connected to the second terminal group TG12. The second flexiblesubstrate FS2 comprises the second connection portion CN2 connected tothe second terminal portion T2. The second connection portion CN2 islocated between the connection portions CN11 and CN12 in planar view.The second terminal portion T2 can be provided at a central portion withrespect to the display portion DA, and the first terminal group TG11 andthe second terminal group TG12 can be provided at positions havinglateral symmetry with respect to the display portion DA. Similarly, thefirst flexible substrate FS1, the second flexible substrate FS2, and theIC chip I1 can be provided to have lateral symmetry with respect to thedisplay portion DA.

The configuration example shown in FIG. 20(B) is different from theabove-explained configuration examples with respect to a feature thatthe second substrate SUB2 comprises protruding portions P1 and P2 onrespective sides of the first terminal portion T1. The second terminalportion T2 comprises a third terminal group TG21 located on theprotruding portion P1 and a fourth terminal group TG22 located on theprotruding portion P2. The first terminal portion T1 is located betweenthe third terminal group TG21 and the fourth terminal group TG22 inplanar view. In the example illustrated, the third terminal group TG21,the first terminal group TG11, the second terminal group TG12, and thefourth terminal group TG22 are arranged in this order in the firstdirection X and located in line in the first direction X. The firstconnection portion CN1 of the first flexible substrate FS1 is connectedto the first terminal group TG11. The second connection portion CN2 ofthe second flexible substrate FS2 comprises a connection portion CN21connected to the third terminal group TG21 and a connection portion CN22connected to the fourth terminal group TG22. The first connectionportion CN1 is located between the connection portions CN21 and CN22 inplanar view.

The first terminal group TG11 and the second terminal group TG12 can beprovided at positions having lateral symmetry with respect to thedisplay portion DA, and the third terminal group TG21 and the fourthterminal group TG22 can be provided at positions having lateral symmetrywith respect to the display portion DA. Similarly, the first flexiblesubstrate FS1, the second flexible substrate FS2, and the IC chip I1 canbe provided to have lateral symmetry with respect to the display portionDA.

The first flexible substrate FS1 and the second flexible substrate FS2shown in the figure can be replaced with a single flexible substrate.

The first terminal portion T1 can be disposed symmetrically by applyingthe configuration example shown in FIG. 20. This point will be explainedwith reference to FIG. 21.

FIG. 21 is a diagram showing the other example of the layout of thefirst terminal portion T1.

The first terminal portion T1 is arranged symmetrically with respect tothe center line CL between the first edge E1 and the second edge E2. Thewidth W11 in the first direction X between the first edge E1 and thefirst terminal portion T1 is equal to the width W12 in the firstdirection X between the first terminal portion T1 and the second edgeE2. The first terminal group TG11 and the second terminal group TG12 arearranged symmetrically with respect to the center line CL. In addition,the first line group CG1 connected to the first terminal group TG11 andthe second line group CG2 connected to the second terminal group TG12are arranged symmetrically with respect to the center line CL.

In this layout, signal delay caused by the difference between the linelength of each line of the first line group CG1 and the line length ofeach line of the second line group CG2 can be suppressed. In addition,the first flexible substrate FS1 and the IC chip I1 can be provided tohave lateral symmetry with respect to the display portion DA.

FIG. 22 is a plan view showing a modified example of the embodiments.

The display device DSP of a first modified example shown in FIG. 22(A)comprises protruding portions P1 and P2 on respective sides of the firstterminal portion T1. Similarly to the first example shown in FIG. 14(A),the liquid crystal layers are interposed between the first substrateSUB1 and the protruding portion P1 and between the first substrate SUB1and the protruding portion P2. The display portion DA is expanded to anarea which overlaps the protruding portions P1 and P2 as represented byhatch lines in the figure. Thus, the display portion DA is expanded tothe area closer to the fourth edge E4, on both sides sandwiching thefirst flexible substrate FS1. Not only the quadrilateral display portionDA, but the display portion DA having a different shape can be realized.

The display device DSP of a second modified example shown in FIG. 22(B)comprises the second substrate SUB2 having an approximately pentagonalshape. The second substrate SUB2 comprises a side S21 which overlaps thefirst edge E1, a side S22 which overlaps the second edge E2, a side S23which overlaps the third edge E3, and sides S24 sand S25 intersectingthe first direction X and the second direction Y. In addition, thesecond substrate SUB2 comprises the protruding portion P including sidesS24 and S25. The display portion DA is expanded to an area overlappingthe protruding portion P as represented by hatch lines in the figure.The display portion DA having an approximately pentagonal shape can bethereby realized.

FIG. 23 is a plan view showing a third modified example of theembodiments.

The display device DSP of the third modified example comprises a sensorSN which overlaps the protruding portion P. The sensor SN is, forexample, a touch sensor which detects contact or approach of an object,a fingerprint sensor which detects a fingerprint, a photo-sensor whichmeasures luminance, or the like. The position of the sensor SN does notoverlap the display portion DA.

FIG. 24 is a cross-sectional view showing the display device DSPcomprising a sensor SN cut along line C-D in FIG. 23.

In the example illustrated, the sensor SN is disposed on the secondupper surface SUB2A of the second substrate SUB2. The second opticalelement OD2 including the second polarizer PL2 is bonded on the secondupper surface SUB2A, but does not extend to the protruding portion P ordoes not overlap the sensor SN. The holding layer HL is located directlyunder the sensor SN. A cover member CM is, for example, a glasssubstrate or a resin substrate. The cover member CM is bonded to thesecond optical element OD2 by an adhesive layer AD. In addition, thecover member CM comprises a through-hole TH which penetrates the covermember CM toward the sensor SN. An object is thereby enabled to contactthe sensor SN. A structure of thinning the only area of the cover memberCM that is opposed to the sensor SN can be adopted instead of thethrough-hole TH. Alternatively, a structure of filling the through-holeTH with a conductive material can also be adopted.

FIG. 25 is a plan view showing a connection structure example of thesensor SN and the second flexible substrate FS2.

In a structural example shown in FIG. 25(A), the detection electrodes Rxand the second terminal portion T2 are electrically connected by theleads L, and the sensor SN and the second terminal portion T2 areelectrically connected by the leads LS. The detection electrodes Rx, thesensor SN, the second terminal portion T2, and the leads L and LS aredisposed on the second upper surface SUB2A. In the example illustrated,the sensor SN is located on a side closer to the first edge E1, and thesecond terminal portion T2 is located on a side closer to the secondedge E2. The second terminal portion T2 and the second flexiblesubstrate FS2 are electrically connected to each other.

In a structural example shown in FIG. 25(B), the sensor SN is disposedon the protruding portion P1 while the second terminal portion T2 isdisposed on the protruding portion P2. The sensor SN is electricallyconnected to the second terminal portion T2 by the leads LS.

In any one of the structural examples shown in FIG. 25, the secondflexible substrate FS2 is connected to a position different from theprotruding portion where the sensor SN is disposed, and the sensor SNand the second flexible substrate FS2 are electrically connected to eachother. The second flexible substrate FS2 functions as a transmissionpath through which the signals from the detection electrodes Rx and thesignals from the sensor SN are transmitted. According to this structuralexample, since the detection electrodes Rx and the sensor SN aredisposed on the same surface (second upper surface SUB2A), the secondterminal portion T2 for transmission of these signals can be integratedat one position and the signals can be taken out by the single flexiblesubstrate.

FIG. 26 is a plan view showing the other connection structure example ofthe sensor SN and the second flexible substrate FS2.

In a structural example shown in FIG. 26, the sensor SN is disposed onthe protruding portion P1 while the second terminal portion T2 isdisposed on the protruding portion P2. The second terminal portion T2 iselectrically connected to the second flexible substrate FS2, on theprotruding portion P2. The sensor SN is electrically connected to thethird flexible substrate FS3, on the protruding portion P1. The secondflexible substrate FS2 and the third flexible substrate FS3 shown in thefigure can be replaced with a single flexible substrate. According tothe structural example, the leads for connection between the sensor SNand the second terminal portion T2 can be omitted, and a width betweenthe display portion DA and the fourth edge E4 in the second direction Ycan be made shorter.

According to the embodiments, as explained above, the sensor-equippeddisplay device capable of making the frame narrower can be provided.

While certain embodiments have been described, these embodiments havebeen presented by way of example only, and are not intended to limit thescope of the inventions. Indeed, the novel embodiments described hereinmay be embodied in a variety of other forms; furthermore, variousomissions, substitutions and changes in the form of the embodimentsdescribed herein may be made without departing from the spirit of theinventions. The accompanying claims and their equivalents are intendedto cover such forms or modifications as would fall within the scope andspirit of the inventions.

What is claimed is:
 1. A display device comprising: a first substrateand a second substrate overlapping the first substrate, wherein thefirst substrate includes a first area, a second area overlapping thesecond substrate, a first edge extending in a first direction, a secondedge crossing the first edge, a third edge crossing the first edge andopposed to the second edge, and a first terminal portion located on thefirst area; the second substrate has a first protruding portionprotruding toward the first edge of the first substrate and a secondedge including a linear portion along the first direction and a concavecurved portion connected to the linear portion and extending toward thefirst edge, the first protruding portion is provided between the secondedge of the first substrate and a center line of the first substrate inplan view, the linear portion extends to a position that overlaps thethird edge of the first substrate, the concave curved portionconstitutes a part of a edge of the first protruding portion, a width inthe first direction of the first protruding portion gradually decreasestoward the first edge, the first protruding portion has an area that isdefined by the concave curved portion, a first virtual line that is anextension line of the linear portion, and a second virtual line that isorthogonal to the first virtual line and passes through an intersectionpoint of the concave curved portion and the first edge in plan view, aplurality of electrodes for touch detection, a second terminal portion,and a plurality of leads connecting each of the electrodes to the secondterminal portion are provided on the second substrate, the secondterminal portion is located on the first protruding portion, and atleast one of the leads crosses the first virtual line and the secondvirtual line and passes through the area.
 2. The display device of claim1, wherein the concave curved portion is provided from an end of thelinear portion to a midst of a way to the first edge of the firstsubstrate in plan view.
 3. The display device of claim 1, wherein thedisplay device has a first panel side corresponding to the first edge ofthe first substrate, a second panel side opposed to the first panelside, a third panel side connecting one end of the first panel side toone end of the second panel side, and a fourth panel side connecting theother end of the first panel side to the other end of the second panelside, and at least a part of a edge of the first protruding portioncorresponds to the third panel side in plan view.
 4. The display deviceof claim 1, wherein the first terminal portion is provided from the oneside to an other side of the first substrate over the center line. 5.The display device of claim 4, wherein a center of the first terminalportion is on the center line of the first substrate.
 6. The displaydevice of claim 5, wherein the first terminal portion comprises aplurality of terminals arranged in the first direction.
 7. The displaydevice of claim 1, further comprising a display area and a frame areadefining the display area, wherein the first protruding portion isprovided in the frame area.
 8. The display device of claim 7, whereinthe first protruding portion is supported on the first substrate via aholding layer.
 9. The display device of claim 8, further comprising aliquid crystal layer located between the first substrate and the secondsubstrate in the display area surrounded by an adhesive layer, wherein apart of the adhesive layer constitutes the holding layer.
 10. Thedisplay device of claim 8, wherein a part of the liquid crystal layer isprovided between the first substrate and the first protruding portion ofthe second substrate.